/usr/lib/ruby/vendor_ruby/cstruct/cstruct.rb is in ruby-cstruct 1.0.1-2.
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require 'cstruct/utils'
#
# ===Description
# CStruct is a simulation of the C language's struct.
# Its main purpose is to manipulate binary-data conveniently in Ruby.
# ===Supported primitive types in CStruct
# * signed types:
# char,int8,int16,int32,int64,float,double
# * unsigned types:
# uchar,uint8,uint16,uint32,uint64
# ===More infomantion
# * source: http://github.com/skandhas/cstruct
# * document: http://cstruct.rubyforge.org/documents.html
# * examples: http://cstruct.rubyforge.org/examples.html
class CStruct
# version
VERSION = "1.0.1"
class << self
# set the options of a struct.
def options opts
@options.merge! opts
end
# Return the endian of a struct;the default is :little.
def endian
@options[:endian]
end
# Return the align of a struct;the default is 1.
def align
@options[:align]
end
# Return the fields of a struct.
def fields
@fields
end
# Return the size of a struct;+size+ similar to +sizeof+ in C language.
#
# Example:
#
# class Point < CStruct
# int32:x
# int32:y
# end
#
# puts Point.size # or Point.__size__
#
def size
@options[:layout_size]
end
alias_method :__size__, :size
end
private
def self.init_class_variables
@fields = {}
@options= { :layout_size =>0, :endian => :little, :align => 1}
end
def self.field(symbol,fsize,fsign,dimension = nil)
field = Field.new(symbol,fsize,@options[:layout_size],fsign,dimension)
@options[:layout_size] += field.byte_size
@fields[symbol] = field
dimension.is_a?(Array) ? (do_arrayfield field):(do_field field)
end
def self.structfield(symbol,sclass,ssize,dimension = nil)
field = Field.new(symbol,ssize,@options[:layout_size],:struct,dimension)
@options[:layout_size] += field.byte_size
@fields[symbol] = field
dimension.is_a?(Array) ? (do_arraystructfield field,sclass):(do_structfield field,sclass)
end
def self.inherited(clazz)
clazz.init_class_variables
end
def self.method_missing(method, *args)
sclass = method_to_class_by_class self,method
sclass = method_to_class_by_class Object,method unless sclass
sclass = method_to_class_by_namespace method unless sclass
sclass = method_to_class method unless sclass
super unless sclass
is_cstruct = sclass.ancestors.select{|x| x == CStruct }
if is_cstruct
symbol,dimension = *args
structfield symbol,sclass,sclass.size,dimension
else
super
end
end
def self.method_to_class_by_class(clazz,method)
method_string_or_symbol = RUBY_VERSION < '1.9' ? (method.to_s):(method)
unless clazz.constants.include? method_string_or_symbol
return nil
end
clazz.const_get method
end
def self.method_to_class_by_namespace(method) #:nodoc: X::Y::A
sclass = nil
class_name_array = self.to_s.split('::')
return nil if class_name_array.size < 2
class_array = []
class_name_array.pop
class_name_array.inject(self){|m,class_name| class_array << m.const_get(class_name.to_sym); class_array.last }
class_array.reverse_each do |clazz|
if clazz.const_defined?(method)
sclass = clazz.const_get(method)
break
end
end
sclass
end
def self.method_to_class(method) #:nodoc: X_Y_A
super_namespace = nil
class_name_array = self.to_s.split('::')
if class_name_array.size < 2
super_namespace = Object
else
class_name_array.pop
super_namespace = class_name_array.inject(Object) {|m,class_name| m.const_get(class_name.to_sym) }
end
namespace_name_array = method.to_s.split('_')
return nil if namespace_name_array.size < 2
sclass = namespace_name_array.inject(super_namespace) {|m,class_name| m.const_get(class_name.to_sym) }
end
def self.do_field(field)
symbol = field.tag
define_method(symbol) { normal_field_to_value(symbol) }
define_method("#{symbol}=") { |value| value_to_field(symbol,value) }
end
def self.do_arrayfield(field)
symbol = field.tag
define_method(symbol) { array_field_to_value(symbol) }
define_method("#{symbol}=") { |value| value_to_arrayfield(symbol,value) }
end
def self.do_structfield(field,sclass)
symbol = field.tag
define_method(symbol) { struct_field_to_value(symbol,sclass)}
define_method("#{symbol}=") { |value| value_to_struct_field(symbol,sclass,value)}
end
def self.do_arraystructfield(field,sclass)
symbol = field.tag
define_method(symbol) { array_struct_field_to_value(symbol,sclass) }
define_method("#{symbol}=") { |value| value_to_array_struct_field(symbol,sclass,value) }
end
def self.unsigned(symbol,fsize,dimension)
field symbol,fsize,:unsigned,dimension
end
def self.signed(symbol,fsize,dimension)
field symbol,fsize,:signed,dimension
end
public
class << self
# args =[symbol,dimension=nil]
[1,2,4,8].each do |i|
define_method("unsigned_#{i}byte") { |*args| unsigned(args[0],i,args[1]) }
define_method("signed_#{i}byte") { |*args| signed(args[0],i,args[1]) }
end
def float(*args) #:nodoc:
field args[0],4,:float,args[1]
end
def double(*args) #:nodoc:
field args[0],8,:double,args[1]
end
alias uint64 unsigned_8byte
alias uint32 unsigned_4byte
alias uint16 unsigned_2byte
alias uint8 unsigned_1byte
alias uchar unsigned_1byte
alias int64 signed_8byte
alias int32 signed_4byte
alias int16 signed_2byte
alias int8 signed_1byte
alias char signed_1byte
end
# call init_class_variables
init_class_variables
public
attr_accessor:owner
def initialize #:nodoc:
@data = "\0"*self.class.size
@data.encode!("BINARY") if RUBY_VERSION >= '1.9'
@owner = []
yield self if block_given?
end
# Return the data buffer of a CStruct's instance.
def data
@data
end
# Fill the date buffer of a CStruct's instance with zero.
def reset
(0...self.class.size).each { |i| Utils.string_setbyte @data,i, 0 }
sync_to_owner
end
# Assign to CStruct's instance.
def data= bindata
raise 'Data Type Error!' unless bindata.is_a? String
self << bindata
end
# Assign to CStruct's instance.
def << bindata
count = @data.size < bindata.size ? @data.size : bindata.size
(0...count).each do |i|
Utils.string_setbyte @data,i,Utils.string_getbyte(bindata,i)
end
end
def sync_to_owner #:nodoc:
return if @owner.empty?
final_offset = @owner.inject(0) do |sum,owner_value|
_,foffset,_ = owner_value
sum+= foffset
end
onwerdata,_,_ = @owner.last
Utils.buffer_setbytes onwerdata,@data,final_offset
end
alias __data__ data
alias __reset__ reset
alias __data__= data=
private
def normal_field_to_value(symbol)
make_normal_field(self.class.fields[symbol],self.class.endian)
end
def array_field_to_value(symbol)
make_array_normal_field(self.class.fields[symbol],self.class.endian)
end
def struct_field_to_value(symbol,sclass)
make_struct_field(self.class.fields[symbol],self.class.endian,sclass)
end
def array_struct_field_to_value(symbol,sclass)
make_array_struct_field(self.class.fields[symbol],self.class.endian,sclass)
end
def value_to_field(symbol,value)
dataref = @data
onwerref = @owner
self.class.class_eval do
field = @fields[symbol]
bin_string = CStruct::Utils::pack [value],@options[:endian],field.byte_size,field.sign
CStruct::Utils.buffer_setbytes dataref,bin_string,field.offset
end
sync_to_owner
end
def value_to_arrayfield(symbol,value)
field = self.class.fields[symbol]
array_length = field.byte_size/field.size
if field.size == 1 and value.is_a? String
if value.length >= array_length
puts "WARNING: \"#{value}\".length(#{value.length}) >= #{symbol}.length(#{dimension})!!"
end
value = value[0...array_length-1]
CStruct::Utils.buffer_setbytes @data,value,field.offset
sync_to_owner
else
raise "No Implement!(CStruct,version:#{CStruct::VERSION})"
end
end
def value_to_struct_field(symbol,sclass,value)
raise "No Implement!(CStruct,version:#{CStruct::VERSION})"
end
def value_to_array_struct_field(symbol,sclass,value)
raise "No Implement!(CStruct,version:#{CStruct::VERSION})"
end
def make_normal_field(field,sendian,sclass = nil)
Utils::unpack(@data[field.offset,field.size],sendian,field.size,field.sign)
end
def make_struct_field(field,sendian,sclass)
value = sclass.new
value << @data[field.offset,field.size]
value.owner << [@data,field.offset,field.size]
unless self.owner.empty?
value.owner += self.owner
end
value
end
def make_array_normal_field(field,sendian,sclass = nil)
dataref= @data
objref = self
value = buffer_to_values field,sendian
def value.metaclass
class<<self; self; end
end
value.metaclass.__send__ :define_method,:[]= do |i,v|
bin_string = Utils::pack [v],sendian,field.size,field.sign
Utils.buffer_setbytes dataref,bin_string,field.offset + i * field.size
objref.sync_to_owner
end
case field.size
when 1
value.metaclass.__send__(:define_method,:to_cstr){ value.pack("C#{value.index(0)}") }
when 2
if RUBY_VERSION > "1.9"
utf_endian = {:little=>"LE",:big=>"BE"}
value.metaclass.__send__ :define_method,:to_wstr do
value.pack("S#{value.index(0)}").force_encoding("UTF-16#{utf_endian[sendian]}")
end
end
when 4
value.metaclass.__send__ :define_method,:to_wstr do
value.pack("L#{value.index(0)}").force_encoding("UTF-32#{utf_endian[sendian]}")
end
end
value
end
def make_array_struct_field(field,sendian,sclass)
buffer_to_structs field,sendian,sclass
end
def buffer_to_single_value(fsize,foffset,iterator,sendian,fsign)
CStruct::Utils::unpack(@data[foffset + iterator * fsize,fsize],sendian,fsize,fsign)
end
def buffer_to_values(field,sendian)
(0...field.byte_size/field.size).map do |i|
buffer_to_single_value(field.size,field.offset,i,sendian,field.sign)
end
end
def buffer_to_single_struct(sclass,ssize,soffset,iterator,sendian,fsign)
value = sclass.new
value << @data[soffset + iterator * ssize,ssize]
value.owner << [@data,soffset + iterator * ssize,ssize]
unless self.owner.empty?
value.owner += self.owner
end
value
end
def buffer_to_structs(field,sendian,sclass)
(0...field.byte_size/field.size).map do |i|
buffer_to_single_struct(sclass,field.size,field.offset,i,sendian,field.sign)
end
end
end
# Define a anonymous union field.
#
# Example:
# in C:
# struct U
# {
# union{
# int x;
# int y;
# }value; /* values is anonymous union's instance */
# };
#
# use CStruct in Ruby:
# class U < CStruct
# union:value do
# int32:x
# int32:y
# end
# end
#
def CStruct.union symbol,&block
union_super = self.ancestors[1]
union_class = Class.new(union_super) do
def self.change_to_union #:nodoc:
@fields.each_key { |symbol| @fields[symbol].offset = 0 }
max_field_size = @fields.values.inject(0)do |max,field|
dimension = field.dimension
dimension_product = 1
if dimension.is_a? Array
dimension_product = dimension.inject(1){|m,d| m *= d }
end
field_size = field.size* dimension_product
max = (field_size> max ? field_size : max)
end
@options[:layout_size] = max_field_size
end
end
union_class.instance_eval(&block)
union_class.instance_eval{change_to_union}
structfield symbol,union_class,union_class.size
end
# Define a anonymous struct field.
#
# Example:
#
# in C:
# struct Window
# {
# int style;
# struct{
# int x;
# int y;
# }position;
# };
#
# use CStruct in Ruby:
# class Window < CStruct
# int32:style
# struct :position do
# int32:x
# int32:y
# end
# end
#
def CStruct.struct symbol,&block
struct_super = self.ancestors[1]
struct_class = Class.new(struct_super)
struct_class.instance_eval(&block)
structfield symbol,struct_class,struct_class.__size__
end
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